I would use the generic "permanent marker" to describe felt tip pens that apply a generally non-erasable ink. The
most typical examples of thistype of pen are the Sanford "Sharpie" pens (there's a red one in my pocket right now)
and the "El Marko" pens. Both of these pens have a strong odor because the pigment is dissolved in a fast-drying
(and therefore volatile) solvent. You have to be careful with them or they will stain your posts.